Single-tube and coaxial photo-acoustic spectrum sound detector and gas detection device adopting sound detector

Abstract

The invention relates to a gas sensing technology and particularly provides a single-tube and coaxial photo-acoustic spectrum sound detector and a gas detection device adopting the sound detector, aiming at solving the technical problems that the acoustic coupling efficiency between an acoustic resonant cavity and a large tuning fork is relatively low when the large tuning fork is used as a sound detector in a current quartz enhanced photo-acoustic spectrum. The single-tube and coaxial photo-acoustic spectrum sound detector has the beneficial effects that firstly, a novel quartz enhanced photo-acoustic spectrum sound detector is designed, and a complete single-tube acoustic resonant cavity is inserted into an oscillation arm gap of a tuning fork type quartz crystal oscillator by virtue of the characteristics of the large oscillation arm gap of the novel tuning fork type quartz crystal oscillator; square holes are formed in the two sides of the single-tube acoustic resonant cavity, and acoustic waves push oscillation arms of the tuning fork type quartz crystal oscillator through the square holes so as to generate an electric signal; the acoustic coupling efficiency is greatly improved by single-tube and coaxial configuration, and the detection signal-to-noise ratio is improved; and secondly, a standing wave mode in the single-tube acoustic resonant cavity is relatively close to an acoustic standing wave mode in a one-dimensional acoustic resonant cavity, so that the length of the resonant cavity is greatly shortened, and meanwhile, the size of a sensor is reduced.

Description

technical field [0001] The invention relates to gas sensing technology, in particular to a single-tube coaxial photoacoustic spectrum sound detector and a gas detection device using the sound detector. Background technique [0002] In recent years, photoacoustic spectroscopy, as a new type of spectral detection technology, has been widely used in various industries such as industrial control, agricultural production, and aerospace detection due to its advantages of zero absorption background, high detection sensitivity, and no wavelength selectivity of detection devices. When a beam of modulated laser light passes through the sample to be tested, if the emission wavelength of the light source matches the wavelength of the absorption line of the sample, the laser energy will be absorbed by the sample. The sample molecules that absorb the light energy are excited to the excited state, and then due to the instability of the excited state, the collision de-excitation will cause ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the acoustic wave coupling efficiency between the acoustic resonant cavity and the large tuning fork is low when a large tuning fork is used as a sound detect...

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